Talks

10801 - 10812 of 18060 Results

Principle of relativity for quantum theory

Marco Zaopo University of Pavia

November 20, 2012

PIRSA:12110073

Quantum Physics
3 point functions in the AdS4/CFT3 correspondence

Agnese Bissi The Abdus Salam International Centre for Theoretical Physics (ICTP)

November 20, 2012

PIRSA:12110053

High Energy Physics
An exact solution of the Dirac equation with CP violation.

Tomislav Prokopec Utrecht University

November 20, 2012

PIRSA:12110076

Astrophysics
Statistical Mechanics - Lecture 7

John Berlinsky McMaster University

November 20, 2012

PIRSA:12110027
Quantum Field Theory 2 - Lecture 7

Francois David CEA Saclay

November 20, 2012

PIRSA:12110008

High Energy Physics
Statistical Mechanics - Lecture 6

John Berlinsky McMaster University

November 19, 2012

PIRSA:12110026
Quantum Field Theory 2 - Lecture 6

Francois David CEA Saclay

November 19, 2012

PIRSA:12110007

High Energy Physics
Superradiant Superconductivity

Baskaran Ganapathy Institute of Mathematical Sciences

November 16, 2012

PIRSA:12110071

Condensed Matter
Statistical Mechanics - Lecture 5

John Berlinsky McMaster University

November 16, 2012

PIRSA:12110023
Quantum Field Theory 2 - Lecture 5

Francois David CEA Saclay

November 16, 2012

PIRSA:12110004

High Energy Physics
Canonical tensor models with local time

Naoki Sasakura Yukawa Institute for Theoretical Physics

November 15, 2012

PIRSA:12110065

General Relativity & Quantum Cosmology
Detecting Gravitational Waves with Millisecond Pulsars

Paul Demorest National Radio Astronomy Observatory (NRAO)

November 15, 2012

PIRSA:12110044

General Relativity & Quantum Cosmology

Principle of relativity for quantum theory

Marco Zaopo University of Pavia

November 20, 2012

PIRSA:12110073

Quantum Physics

In a generic quantum experiment we have a given set of devices analyzing some physical property of a system. To each device involved in the experiment we associate a set of random outcomes corresponding to the possible values of the variable analyzed by the device. Devices have apertures that permit physical systems to pass through them. Each aperture is labelled as "input" or "output" depending on whether it is assumed that the aperture lets the system go inside or outside the device. Assuming a particular input/output structure for the devices involved in a generic experiment is equivalent to assume a particular causal structure for the space-time events constituted by the outcomes happening on devices. The joint probability distribution of these outcomes is usually predicted assuming an absolutely defined input/output structure of devices. This means that all observers of the experiment agree on whether an aperture is labelled as "input" or "output". In this talk we show that the mathematical formalism of quantum theory permits to predict the joint probability distribution of outcomes in a generic experiment in such a way that the input/output structure is indeed relative to an observer. This means that two observers of the same experiment can predict the joint probability distribution of outcomes assuming different input/output labels for the apertures. Since input/output structure is the causal structure of the space-time events constituting the outcomes involved in the experiment we conclude that in quantum theory, the causal structure of events may not be regarded as absolute but rather as relative to the observer. We finally point out that properly extending this concept to the cosmological domain could shed light on the problem of dark energy.
3 point functions in the AdS4/CFT3 correspondence

Agnese Bissi The Abdus Salam International Centre for Theoretical Physics (ICTP)

November 20, 2012

PIRSA:12110053

High Energy Physics

I will present recent developments in the computation of three point functions in the AdS4/CFT3 correspondence. More specifically I will consider two different computations for three point functions of operators belonging to the SU(2)XSU(2) sector of ABJM. I will discuss first the generalization of the determinant representation, found by Foda for the three-point functions of the SU(2) sector of N = 4 SYM, to the ABJM theory and secondly semiclassical computations in the case where two operators are heavy and one is light and BPS, comparing the results obtained in the gauge theory side using a coherent state description of the heavy operators with its string theory counterpart calculated holographically.
An exact solution of the Dirac equation with CP violation.

Tomislav Prokopec Utrecht University

November 20, 2012

PIRSA:12110076

Astrophysics

After a brief overview of electroweak baryogenesis, I will show how to construct a solution of the Dirac equation for a CP violating kink wall. This solution nicely reduces to the known solution for a CP violating thin (step) wall. The novel solution can be helpful for studies of baryogenesis sources at strong first order phase transitions, which is relevant for electroweak scale baryogenesis studies.
Statistical Mechanics - Lecture 7

John Berlinsky McMaster University

November 20, 2012

PIRSA:12110027
Quantum Field Theory 2 - Lecture 7

Francois David CEA Saclay

November 20, 2012

PIRSA:12110008

High Energy Physics
Statistical Mechanics - Lecture 6

John Berlinsky McMaster University

November 19, 2012

PIRSA:12110026
Quantum Field Theory 2 - Lecture 6

Francois David CEA Saclay

November 19, 2012

PIRSA:12110007

High Energy Physics
Superradiant Superconductivity

Baskaran Ganapathy Institute of Mathematical Sciences

November 16, 2012

PIRSA:12110071

Condensed Matter

In Dicke Superradiance, a collection of 2-level atoms interacting with a single boson mode acquires, through quantum coherence, an enhanced emission property and a rich dynamics. We suggest possibility of Dicke superradiance in a BCS superconductor. The necessary 2-level atoms are identified with Anderson pseudo spins seeing a self consistent mean field in k-space. A way to couple these 2-level bose atoms to an external boson mode and create a novel non equilibrium superradiant superconductivity (SRSC) is suggested. Our mechanism offers a hope to realize transient superconductivity, even at room temperatures, in the pseudo gap phase of certain underdoped cuprates. Recent experiments are briefly discussed in this light. Further SRSC exhibits interesting quantum entanglement and superfluorescence properties.
Statistical Mechanics - Lecture 5

John Berlinsky McMaster University

November 16, 2012

PIRSA:12110023
Quantum Field Theory 2 - Lecture 5

Francois David CEA Saclay

November 16, 2012

PIRSA:12110004

High Energy Physics
Canonical tensor models with local time

Naoki Sasakura Yukawa Institute for Theoretical Physics

November 15, 2012

PIRSA:12110065

General Relativity & Quantum Cosmology

Tensor models are generalization of matrix models, and are studied as discrete models for quantum gravity for more than two-dimensions. Among them, the rank-three tensor models can be interpreted as theories of dynamical fuzzy spaces, and they generally have the feature of
respecting symmetries. In this talk, after briefly reviewing some results on Euclidean models such as spontaneous generation of fuzzy spaces and Euclidean general relativity respecting the diffeomorphism symmetry on them, I will present a way to introduce “local” time to the rank-three tensor models by constructing “local” Hamiltonians. The consistency among the multiple ways of local time evolutions is guaranteed by the on-shell closure of the constraint algebra among the
local Hamiltonians and the symmetry generators of the tensor models. The constraint algebra is shown to approach the DeWitt algebra in a formal continuum limit. I will also discuss the two-fold uniqueness of the local Hamiltonians, and will briefly show some preliminary results on the quantization.
Detecting Gravitational Waves with Millisecond Pulsars

Paul Demorest National Radio Astronomy Observatory (NRAO)

November 15, 2012

PIRSA:12110044

General Relativity & Quantum Cosmology

Millisecond spin-period radio pulsars provide us with unique astronomical "laboratories" for exploring fundamental physics in a variety of ways -- from the physics of matter at super-nuclear density, to experimental tests of gravity. They have also provided the only experimental evidence so far for the existence of gravitational waves (GW). A set of millisecond pulsars acting as precise astronomical clocks may also be used as a direct GW detector, sensitive to the nanohertz-frequency GW expected to be emitted by supermassive black hole binary systems or other more exotic sources. In this talk I will present the project status and recent GW upper limits from the NANOGrav project. I will also discuss expected near-future improvements in the measurement, including recent work aimed at better characterizing and mitigating the effect of multi-path propagation effects in the interstellar medium.

Title	Date	Collection	Type	Info
Principle of relativity for quantum theory	2012‑11‑20	Quantum Foundations	Scientific Series	View details
3 point functions in the AdS4/CFT3 correspondence	2012‑11‑20	Quantum Fields and Strings	Scientific Series	View details
An exact solution of the Dirac equation with CP violation.	2012‑11‑20	Cosmology and Gravitation	Scientific Series	View details
Statistical Mechanics - Lecture 7	2012‑11‑20	12/13 PSI - Statistical Mechanics	Course	View details
Quantum Field Theory 2 - Lecture 7	2012‑11‑20	12/13 PSI - Quantum Field Theory 2	Course	View details
Statistical Mechanics - Lecture 6	2012‑11‑19	12/13 PSI - Statistical Mechanics	Course	View details
Quantum Field Theory 2 - Lecture 6	2012‑11‑19	12/13 PSI - Quantum Field Theory 2	Course	View details
Superradiant Superconductivity	2012‑11‑16	Quantum Matter	Scientific Series	View details
Statistical Mechanics - Lecture 5	2012‑11‑16	12/13 PSI - Statistical Mechanics	Course	View details
Quantum Field Theory 2 - Lecture 5	2012‑11‑16	12/13 PSI - Quantum Field Theory 2	Course	View details
Canonical tensor models with local time	2012‑11‑15	Quantum Gravity	Scientific Series	View details
Detecting Gravitational Waves with Millisecond Pulsars	2012‑11‑15	Strong Gravity	Scientific Series	View details

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Format results

Principle of relativity for quantum theory

3 point functions in the AdS4/CFT3 correspondence

An exact solution of the Dirac equation with CP violation.

Statistical Mechanics - Lecture 7

Quantum Field Theory 2 - Lecture 7

Statistical Mechanics - Lecture 6

Quantum Field Theory 2 - Lecture 6

Superradiant Superconductivity

Statistical Mechanics - Lecture 5

Quantum Field Theory 2 - Lecture 5

Canonical tensor models with local time

Detecting Gravitational Waves with Millisecond Pulsars

Principle of relativity for quantum theory

3 point functions in the AdS4/CFT3 correspondence

An exact solution of the Dirac equation with CP violation.

Statistical Mechanics - Lecture 7

Quantum Field Theory 2 - Lecture 7

Statistical Mechanics - Lecture 6

Quantum Field Theory 2 - Lecture 6

Superradiant Superconductivity

Statistical Mechanics - Lecture 5

Quantum Field Theory 2 - Lecture 5

Canonical tensor models with local time

Detecting Gravitational Waves with Millisecond Pulsars